Press for chip panels having a plurality of steps along the wedge edge of the press



K. VAN HULLEN ETAL Aprll 14, 1970 3,506,521 PRESS FOR CHIP PANELS HAVING A PLURALITY 0F STEPS v ALONG THE WEDGE EDGE OF THE PRESS Filed Jan. 17, 1966 WMR mm "P wwo m N MT T 6 HANS GREFEN ATTORNEY United States Patent U.S. Cl. 156-369 2 Claims ABSTRACT OF THE DISCLOSURE The invention relates to a press for making chip boards. The press die is constructed in a wedge-shaped form at the entrance of the conveying means, with the wedge form being stepped to prevent lateral displacements of the chip fleece.

The invention relates to a press for chip panelling which is provided with a band for traveling over a press table and a press die arranged above said table.

In such presses, the press die is usually constructed in wedge-shaped form at the entrance of the conveyor band, so that the jaw of the press is of conical shape. The use of such means results in a pre-sealing of the chip fleece cross-section at the jaw region of the press, without at the same time resulting in greater cutting forces during the press stroke.

It has been shown in practice, that with such conical construction of the press cover, during the stroke of the press for moving the chips in which the chip fleece arrives in the area of the press jaw to change the structure of the chip fleece to such an extent that a considerable weakening of the panels at this position takes place.

The object of the invention is to overcome this disadvantage in known presses.

According to the invention, the press surface of the press stamp is stepped at the presss jaw in the direction of the conveyors travel. The press stamp thus attains the form of a stepped wedge in the region of the inclined press wedge which joins directly with the particular press surface of the press die extending parallel to the press table and advantageously has a greater number of comparatively shorter and flatter steps.

As an example, the wedge steps arranged in greater number, one after the other, are constructed in such a manner that the press surfaces adjacent the chip fleece extend substantially parallel to the upper surface of the chip fleece. The surfaces forming the passage between the individual wedge steps are advantageously at a sharp angle, e.g. of about 45 to the top surface of the chip fleece. In addition, it is helpful to round 01f the surfaces and edges at the junctures of wedge steps.

As a result of the stepped construction of the press in the region of the press displacements of the fleece in the cross-section lying in the press jaw are prevented with certainty, since there cannot arise any great displacement of the fleece material in horizontal direction, i.e. against the direction of the conveyors travel. The danger of weakening the plates at points in the region of the jaw of the press is thus overcome.

The drawing illustrates an advantageous embodiment of the invention.

FIG. 1 shows schematically a press of known con- 3,506,521 Patented Apr. 14, 1970 struction, outfitted with the stepped wedge of the invention, and

FIG. 2 shows the portion of the press of FIG. 1, in the region of the presss jaw.

The press consists of a press table 1 and a press ram 2. The feeding of the chip fleece 3 to the press, as well as the discharge of the pressed panels 3a, is effected by means of a sieve band 4, which is supported on the press table 1 during the presss operation.

The pressing of the plates takes place, in a known manner, in consecutive strokes, after the sieve band 4 is carried along the press die 2, in the direction of the arrow.

As shown in the drawing, the jaw 5 of the press is wedge-shaped. For this purpose the press die 2, at the entrance side of the fleece web, is provided with an extension 6 which is inclined relative to the plane of the press table 1 and is therefore wedge-shaped.

A stepwise wedge 7 is secured at the wedge-shaped extension 6, said stepwise wedge comprising a plurality of consecutive flat wedge steps 7a, 7b, 7c, etc. (a total of six steps being shown in the drawing). The first wedge step 7a is disposed directly at the juncture N between the completed panel and the chip fleece 3. As shown in particular in FIG. 2, the press surfaces 7 adjacent the press table I extend substantially parallel to the horizontal upper surface of the chip fleece 3, and the press table, while the surfaces 7" at the junctures of the individual wedge steps are inclined at an angle of about 45 thereto. The junctions between the faces 7' and 7" are strongly rounded.

As a result of the arrangement of the stepwise wedge 7 at the presss jaw, the part of the chip fleece disposed in the region of the stepped wedge 7, is sealed stepwise during the press strokes of the press ram. Since no sig nificant displacement of the chip fleece material outward takes place, the fleece movements which could lead to a weakening of the plate structure are effectively overcome.

We claim:

1. In a press for chip panels, a press table, a press ram displaceable vertically above said press table, said press table having a feed end portion and a discharge end portion, said ram being provided with an upwardly slanted wedge-shaped extension above said feed end portion, a stepwise wedge secured to the bottom face of said extension and formed with a plurality of steps, a .conveyor band for chip fleece traveling along said table in a direction from said feed end portion towards said discharge end portion, said steps of said wedge having faces substantially parallel to said table and adjoining respective faces slanted in the direction of said bands travel.

2. In a press according to claim 1, the junction portions between said parallel faces and said slanted faces being rounded.

References Cited UNITED STATES PATENTS 2,136,730 12/1938 Sweetland 144-328 2,890,496 6/1959 Williams -154 JOHN T. GOOLKASIAN, Primary Examiner J. C. GIL, Assistant Examiner U.S. Cl. X.R. 

